Bleaching compound



ing of textiles and the like ide, which results in solutions of moreac-- PatenteelApr. ii, res

. in Drawing.

(GEEK) UNDER THE ACT 0F BGE 3, 1888, A5

This invention described herein may be manufactured and used by or forthe Government for governmental purposes without the payment to me ofany royalty thereon.

This invention relates to a compound for bleaching textiles such ascotton cloth, wool yarn,rayon cloth and the like, and to novel solutionsthereof for bleaching purposes.

It has been found by the applicant that chloroimide of succinic acid, aso known as succinchlorimide, has eficient and advantageous bleachingproperties. i

This compound is represented-by the following structural formula:

a The objea pres invention is ta provide a bleaching agenthavin anintensity. of action which is quite 'de 'itely intermediate between themore intense and the less intense bleaching agents heretofore used.Further objects will be apparent from the following description of theinvention.

Broadly the invention com rises the bleachv y aqueous solutions ofsuccinchlorimide which may be either acid or alkaline in reaction. Thebleaching agents at present employed in the textile industry are ofvarious kinds, such as chlorine gas that may be led into waterysolutions giving chlorine water, which Application filed Eebruary 1%,1932. serial Ho. 592,682.

1 so, 1928; are e. e. 757) this class may be mentioned those of thegeneral type of hydrogen peroxide. that alkaline reaction may beestablished, which is often necessary in bleaching rocesses, thecompound sodium peroxide, a 0

In order and sodium perborate, NaBO are also used in the industry.

Bleaching agents are needed for certain purposes in the textile industrywhich are less prompt and less intense than are the bleachingagentscontaining chlorine and yet more. active than the-bleaching agentswhichjare as slow in their bleachingaction as those of the general typefof hydrogen peroxide or those bleaching proce'sse'swhere alkalinereaction is necessary to beestablished by using compounds such.a'ssodium peroxide, Na O or sodium perborate,-Na BO The new solutionsof succinchlorimide' have I been found tohave an intensity for bleachingcotton cloth and the like intermediate between the intensity of thebleaching agents heretofore used.

An acid or alkaline solution of succinchlorimide will also effectbleaching. An aqueous solution of this compound is moderately acid inreaction. There can be added to an solutions certain alkalies thebleaching properties of acid or alkaline solutions of succ1n-,chlorimide bein present in about the same relative intensities. Eitherthe acid or alka line solutions of the succinchlorimide are quitedefinitely intermediate between the is a rather active bleaching agent;or the? 'more intense bleaching powder and the less chlorine gas may beled into aqueous solutions of sodium carbonate or sodium hydroxtivebleaching agents as they doubtless contain the compound sodiumhypochlorite, NaOCl. The chlorine gas may also be allowed to assnovercalcium hydroxide with which it reacts, forming chiefly the compoundcalcium chloro -hypochlorite, ClCaOCl; this product'is incompletelysoluble in water and such solutions are active bleaching agents.

For certain uses in the textile industry bleaching agents are employedwhich are more mild in their bleaching action than any of the chlorinebleaches disclosed above. Of

intense sodium perborate.

It has been found that cotton cloth may be effectively bleached by theuse of an aqueous solution containing 3% of succinchlorimide, which isequivalent to about 1.6% available chlorine. Weaker solutions ofsuccinchlorimide may of course be used and in some cases are moreadvantageous. When an alkaline bleaching solution is desired theaddition of one equivalent of an alkaline compound to the solution hasbeen found to be effective. For example: four-tenths grar'n' of sodiumcarbonate may be added to the solution for each gram ofsuccinchlorimide.

Having described my invention what I wish to secure by Letters Patentis:

1. A method of bleaching textile materials which comprises subjectingthe materials to the action of an aqueous solution of succin chlorimide.

5 2. A method of bleaching textilematerials which comprises sub'ectingthe materials to the action of an aci solution of succinchlorimide.

3. A method of bleaching textile materials 1 which comprisessubjectingthe materials to to the action of an alkaline solution ofsuccinchlorimide.

4. A composition for bleaching textile material consisting of aqueoussolutions of suc- 15 cinchlorimide; a 1

5. A composition for bleaching textile material consisting of acidsolutions of succinchlorimide.

6. A composition for bleaching textile ma- O-terial consisting ofalkaline solutions of succinchlorimide.

CYRUS B. WOOD.

